Mr. Bannon added, “They are going to try to say the Russians worked with WikiLeaks to give this victory to us.”
The account of how Mr. Manafort first raised the prospect that Ukraine had been behind the hack was included in an F.B.I. report about an interview the special counsel’s office did with Mr. Gates in April 2018. Mr. Gates said Mr. Manafort’s theory echoed one that had been pushed by a Ukrainian businessman who had worked with Mr. Manafort and Mr. Gates when they consulted for the government there years earlier. Mr. Mueller’s office has said that the Ukrainian businessman, Konstantin V. Kilimnik, has ties to Russian intelligence.
“Gates recalled Manafort saying the hack was likely carried out by the Ukrainians, not the Russians, which parroted a narrative Kilimnik often supported,” according to the F.B.I. interview report. “Kilimnik also opined the hack could have been perpetrated by Russian operatives in Ukraine.”
It is unclear when Mr. Trump embraced the theory. In April 2017, just three months into his presidency, he first raised the issue publicly, questioning how the F.B.I. conducted its investigation into the hack and why agents declined to take the server from the Democrats to more closely examine who breached it.
The Democrats “get hacked, and the F.B.I. goes to see them, and they won’t let the F.B.I. see their server,” Mr. Trump told The Associated Press.
“They brought in another company that I hear is Ukrainian-based,” Mr. Trump said in an apparent reference to a company the Democrats brought in to investigate the hack. “That’s what I heard. I heard it’s owned by a very rich Ukrainian.”